Abstract: The present disclosure relates to a hydraulic system for a crane with at least one hydraulic circuit, which comprises at least one hydraulic consumer, and a constant pressure network, wherein the at least one hydraulic circuit is coupled with the constant pressure network via at least one pressure reducer, whereby a higher volume flow with low pressure as compared to the constant pressure network can be generated in the hydraulic circuit.
Abstract: Methods for making various titanium base alloys and titanium aluminides into engineering components such as rings, tubes and pipes by melting of the alloys in a vacuum or under a low partial pressure of inert gas and subsequent centrifugal casting of the melt in the graphite molds rotating along its own axis under vacuum or low partial pressure of inert gas are provided, the molds having been fabricated by machining high density, high strength ultrafine grained isotropic graphite, wherein the graphite has been made by isostatic pressing or vibrational molding, the said molds either revolving around its own horizontal or vertical axis or centrifuging around a vertical axis of rotation.
Abstract: A tubular post is erected from a retracted position in the deck of a load receiving ship to accommodate load transfer operation. A highline connection established by an automated rigging technique substantially reduces manpower requirements, with all receiving station equipment stowed below deck for watertight integrity and to minimize radar cross-section.
October 26, 2000
Date of Patent:
August 20, 2002
The United States of America as represented by the Secretary
of the Navy
Abstract: An automatic control system for operating the inhaul and overhaul winches of a high line transfer system automatically changes the velocity of a trolley between set landing and set transfer velocities and between set landing and set terminal velocities at a constant rate with respect to distance. Digital and graphic displays of trolley distance from a receiver ship and a supply ship and a graphic display of trolley velocity relative to the ship it is approaching are provided.
Abstract: This invention relates to a boat designed as a self-hoisting unit for the vertical and horizontal transfer of persons and/or equipment from a ship to an offshore platform and vice versa. The boat carries a hollow mast forming a guide for a cable, the upper end of which will be attached to a carrier structure extending outwardly from a platform or ship. The mast is held by shrouds so as to withstand large flexural strains. For compensating sea-swell, the lower end of the cable passes over a damper unit comprising an hydraulic cylinder associated with pulleys of two opposed tackle-blocks. The cable is driven by a winch so that the boat can autonomously hoist itself to the platform deck level, or lower itself down to the sea or onto the deck of a ship. The mast height is sufficient for generating an uprighting torque ensuring horizontal stability of the boat during its ascent and descent.
Abstract: The nacelle (3) is characterized in that it includes at least one cable (6) having a top end that leaves the nacelle upwardly and a bottom end that leaves the nacelle downwardly, and a mechanism (11) enabling the nacelle to move up and down the cable when the top end of the cable is hooked to a hook unit (4). A mechanism enables the top portion of the cable to be subjected to a tension greater than the weight of the nacelle while the bottom portion (7) of the cable is fixed to an anchor point, said tensioning mechanism serving to vary the distance between the nacelle (3) and said hook unit at the top end of the cable. Further, mechanism (12, 14) acts on command, on said tensioning mechanism in such a manner as to prevent the distance between the nacelle (3) and the hook unit (4) at the top end of the cable from shortening while not preventing it from lengthening.
Abstract: An aerial cableway for transferring personnel/goods between a vessel and a fixed installation at sea, consisting of a support cable stretched between the vessel and the fixed installation. A winch provided with a slippage device maintains constant tension in the support cable which, by means of a securing member, is releasably attached to a complementary securing member on the vessel. A gondola is suspended from a trolley on the support cable. A pulling line attached to the trolley controls hauling the gondola up and down the support cable between the vessel and the fixed installation by means of a pulling winch on the fixed installation. The fixed installation is provided with an outrigger at the outer end of which the securing member for the support cable is fastened so as to be able to be raised and lowered by means of a hoisting cable which is maneuverable from the fixed installation.